According to the International Corporate Governance Network (ICGN) Model Mandate:

The ICGN Model Mandate provides guidelines for institutional investors on governance, ESG integration, and stewardship practices.

Why B (Disclose ESG risks in portfolios) is correct:

The ICGN Model Mandate states that investment managers should assess and disclose ESG risks that affect their portfolios.

This ensures transparency and helps asset owners understand risk exposures.

Why not A or C?

A is incorrect—disclosing voting activity alone does not fulfill the full engagement disclosure requirement.

C is incorrect—while long-term themes are relevant, ESG risk assessment is a more explicit requirement.